AirHint found the following cheapest return flights from Washington (IAD) to Cancun (CUN) in December 2025 (see full year).

Return flights

15 Dec - 18 Dec	United	direct
02 Dec - 04 Dec	Delta
10 Dec - 15 Dec	Aeromexico
03 Dec - 08 Dec	Aeromexico
07 Dec - 12 Dec	Aeromexico
05 Dec - 10 Dec	United	direct
06 Dec - 10 Dec	United	direct
12 Dec - 15 Dec	Aeromexico
12 Dec - 14 Dec	Delta
02 Dec - 04 Dec	United	direct
30 Dec - 06 Jan	Delta
30 Dec - 06 Jan	United	direct
29 Dec - 06 Jan	Aeromexico
27 Dec - 01 Jan	Aeromexico
30 Dec - 02 Jan	Aeromexico
30 Dec - 03 Jan	Aeromexico
30 Dec - 04 Jan	Aeromexico
31 Dec - 05 Jan	United	direct
27 Dec - 03 Jan	Aeromexico
30 Dec - 02 Jan	United	direct

Also check the deals for one-way flights from Washington to Cancun in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Washington to Cancun in December from 385€

Return flights